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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11a4ed4d632004d754e7eea9b94bdd51d1aa37163bd4ad113c3b10368404775' 
  AND token = 'kyrUMA8GCGP4fuJ8r8FFpultrvO7VhrF/Pd8l+nVptY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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