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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f8e92cd40425e799755622356bdc70ec56d7eeb98829438f849ddd487444a5' 
  AND token = 'WcoLeBfdlHSRnKP8jgcpzfRC1joJzeWmlHTt50Iv/hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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