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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9288ec00cd9f5e79ad63971b9b9a528cc5e77a41cc6de68162f79cba4c3719' 
  AND token = 'ubeWOJ4lq0QEqyU7sRBbnK+mXgGOkgGKm17gTxjQjN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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