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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05c8d59ce6ae09aab71e30b0d04b41839ec365d18258e18eec34c62e499dec8' 
  AND token = 'DmS4/8q9Uqbk1F9QoA7p8NtbDlTfB4jAfmN1s7VKVq0=' 
  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"
    }
  }
}