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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229012c6c15eea7c5e95687e277dff1cfe356532e35ef2a32face63dd42548c2' 
  AND token = '5B543Kdn56p9/PkI+3MbI0xLqJngNQS8eh+BTKWhLbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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