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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22500f4f2f374d8fc689236898c7cb7764f6fdf37d5a0daac213160b70503ae' 
  AND token = 'VcGUlZ15NfUL+iVvMspLpHtZ79Rd4DUpr9Cf76jf5y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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