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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a907ea9fd5ae7423ad1b1700652b8b23a650f0e158e1ee530d475c16b646f9' 
  AND token = '5AzlqlpHEPtVeGPIIQIVqYLO5xHPJ744yqvKC8u6qME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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