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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f870abe4ba89005a81e69a76a134eb212c90c3e132ae2c6399cca3d24ba9dc35' 
  AND token = '2XELSkuesZFZG2QoQS4nJ1PcFbeaf8ULYKCYTEzapRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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