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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af634a486135e10658738c23ec52b4592efe8a979751e7557174bb1283cb6fe' 
  AND token = 'pjJ4SijTtt7cvsUjkd3PbDH3xVppzlozX9xRwH0aNM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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