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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a7ea5be61fe1de3ae0db383025ee16adab57cf474d00cc2e530cacb663f292' 
  AND token = 'v7SnFKje9+2li+Hi1khz22J6BLCfpL9ctSPw9x5tBXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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