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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff48cd7f26c825f0e4c78ac0aa37b8c38d04fabd43e805fb6741d7715920e183' 
  AND token = 'b4tf8iJPpfYJv7TjEefNmBQrSHYU7tcmFz23oo8ICDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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