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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8789fe9dad10c711e91c9af93ae4014e5ad8e8e7fb34a0fc62fb77164fe58b' 
  AND token = 'L/3OmMLTapGQGlpbJ99tijVFOeDFyxape7ncR0mRN0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}