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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff3fbf18f3669e911beb1bb683e5b90f6d6ff9df82b7a941a244b1abf298ea' 
  AND token = 'hOrE6B9aBEO5qno59m0hT1O6B5P2cjlEiRXHGGArsPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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