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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4501520fd63bc7ecfd63ed91fffc82dec8aeca27a6e2064774fac3e1f2747eb8' 
  AND token = 'Ty1bOOMtVbp1EdQPr2ekTnWtnT1/ZVjxZa92qAv1d7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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