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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3f81a9ca70c074ff8115ff1c12f4fa6f7ffaa9158f2f7158f4bf5e20815a8e' 
  AND token = 'hY+/y5yKid1X+ce5XjSZGUNZTYdP5bSo+6ebwIgWuCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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