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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b2cb309204680cc48cc7e2c7202c1c78e3b8a924cd4bb62e06a7b0f458430c' 
  AND token = 'Tsc4kW3UA8PF62xg+QgwIJZWigNvvTy9CNsDhReQC/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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