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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fb64501b60c3100aad9a3d070defe82c2d1f3aa59a88e0505df2cd3534b8ce' 
  AND token = 'hakcZYToSId6jVFybknH9g5LjQZ+5G8T6H9T5LYKxFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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