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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0d22067b731745818aa8f03ab54f6254ad0a5cf806c5f4a8bea1ff0bc0da7a' 
  AND token = 'dtt6pkkpPCjqNohTdZVUW5AWLvntnaMQVN373puFTao=' 
  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"
    }
  }
}