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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1055c13b8f868af3b03333c7b7a27d0f0b5fe32697fc0d1de66384902dd9e7' 
  AND token = '9V6Oa0+Nnuz4at2xM3bXqkpF2t+d+It4KykW+G50n5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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