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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebda2880c2909472d7ca52829ab7fc753f0bd1d1f1b6c456a8ab81837992f2e4' 
  AND token = 'r8nVq+UJmo7Xw1yciWi6OO6qx1XqDXZe/k1yyta0F+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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