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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf713f192a5c0a2478a44ee188aa8062d1821a7f7a2af1b18870c2348f6fb9b' 
  AND token = 'HVRCS0EAmfUMLRonEggixyZ6A/tQBDSRm7Hwh4cuu5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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