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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4ac5ef5925fe266c68dfabe844f50301d27798d6f9fc684d34085da8adc139' 
  AND token = 'Bt9NhyPt6Wuy22XNPHJPvSq4NinRFzZpiN2ysmBLwk0=' 
  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"
    }
  }
}