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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90b9941311205938e4ac09bf00868f414ceb27d1a7e5673ac2eecb6a755d858' 
  AND token = '/KWPMqh55eGSHUSXRrip1pnny6biSz1LEh0gvcMQ0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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