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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82819a1f1ced6432f15c57823449ef2437bd64ed3136f51c741f3ab35f45704d' 
  AND token = 'G7ZILD5JWn+HO2g6AOOQJfsvaEquFY5pL2ZTJIr7zeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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