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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf2885ba73d66ea27fb8f4046cb370f267ebd71f5ebd130b11bc39b7f1970d8' 
  AND token = 'B8tPKm85qx8RZ+x3nkw2itopZFiNthQoOe5dpUfLGXM=' 
  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"
    }
  }
}