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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923748b6b572bb147885db37d28b4b33c6b8b21071c3daea14df53090848d798' 
  AND token = 'v791E3GRZKhoKWH6azZAyxsNv7mXEh9YDeJq4jA5EaA=' 
  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"
    }
  }
}