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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495e7a2b3c7aea291d4c02359ad822002e034d6d6c9d2dbdef451bc7ae295656' 
  AND token = 'on81nCoDu8vDCu+VPmmYljijWSPgEpOms6D5GkO6JC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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