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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc16461a6bae1b39192899c651a26ad1de0f05a1867590d529f9afbe439bfc1b' 
  AND token = 'YMUmE0Oy2R4x84Wi3QYOfwkEL8Wwh32i1jGy84ofS78=' 
  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"
    }
  }
}