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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b8735c0585216978798c3582569e534c3e2bfe202ae731aaa0a358a0abe6cb' 
  AND token = 'qoUDYxiJjrNvRWKLQ3De5ItsB/CB8EAL/u01afm0PGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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