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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e6138a55f457b87c087fb928ec9562d0908934b9205a2b0b1a7fab472c88ac' 
  AND token = 'qYsCeqyht/USKnc6uGrMG5Y0QfvrTwHwTDc+Geb4JvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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