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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c2d187dc79666d598628e5544e5ed561d16b27571eafe814d95400c06e2742' 
  AND token = 'cyMp2YdBfZk8eJExHEXpS46Utg6SO3bV2hAdI43hbx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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