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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a915c965db7020251c5b4a828c8ab4260a75123216b45e201acb771399b0750e' 
  AND token = 'Uh+I8QzwE/RbgwD4ykIgcon5fLYwRXZnPCrylpK9pWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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