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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d09839b826b6e6e0e9c3e414ffef895949c87a550677c2ed2c0a930833a78a2' 
  AND token = '2RKM3Pzt/P2uSWuS+klhAIWjLrzQglzmpt4aCXogkag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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