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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70480249b70af5d557982966c686bf03f09a7d4bb0e7f55ff28342dc70eb4a2e' 
  AND token = 'r3zx1ax2zLRFn8EdVD3+fKzCgm7OcEqn3oArwm4DsLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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